Address listed flaws in implementation

02/ast.hpp

@@ -24,6 +24,16 @@ struct branch {
 
 using branch_ptr = std::unique_ptr<branch>;
 
+struct constructor {
+    std::string name;
+    std::vector<std::string> types;
+
+    constructor(std::string n, std::vector<std::string> ts)
+        : name(std::move(n)), types(std::move(ts)) {}
+};
+
+using constructor_ptr = std::unique_ptr<constructor>;
+
 struct definition {
     virtual ~definition() = default;
 };
@@ -108,3 +118,11 @@ struct definition_defn : public definition {
 
     }
 };
+
+struct definition_data : public definition {
+    std::string name;
+    std::vector<constructor_ptr> constructors;
+
+    definition_data(std::string n, std::vector<constructor_ptr> cs)
+        : name(std::move(n)), constructors(std::move(cs)) {}
+};